was shimmering, but I was unable to make out what it was. I sat charting the country until the sun had set and it was so dark that I could no longer distinguish details. Then I climbed down to my companions waiting for me so eagerly at the bottom of the great tree. For once I was the hero of the expedition. Alone I had thought of it, and alone I had done it; and here was the chart which would save us a month's blind groping among unknown dangers. Each of them shook me solemnly by the hand.
But before they discussed the details of my map I had to tell them of my encounter with the ape-man among the branches.
"He has been there all the time," said I.
"How do you know that?" asked Lord John.
"Because I have never been without that feeling that something malevolent was watching us. I mentioned it to you, Professor Challenger."
"Our young friend certainly said something of the kind. He is also the one among us who is endowed with that Celtic temperament which would make him sensitive to such impressions."
"The whole theory of telepathy——" began Summerlee, filling his pipe.
"Is too vast to be now discussed," said Challenger, with decision. "Tell me, now," he added, with the air of a bishop addressing a Sunday-school, "did you happen to observe whether the creature could cross its thumb over its palm?"
"No, indeed."
